<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <input type="button" value="一个按钮" v-on:click="show()"><br><!--括号不传参可以省略-->
    <input type="button" value="一个按钮" @click="show()">

</div>

<script src="js/vue.js"></script>
<script>

  //1.创建vue的核心对象
  new Vue({
    el:"#app",
    data(){
      return {
        username:"",
        url:"https://www.baidu.com"
      }
    },
    methods:{
        show(){
            alert("我被点了")
        }
    }
  });


</script>

</body>
</html>